Switching voltage regulator having a charge pump circuit

Details Switching voltage regulator having a charge pump circuit Switching voltage regulator having a charge pump circuit

1997-12-19

1999-10-05

Sterrett, Jeffrey

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323317, G05F 1575

Patent

active

059630256

ABSTRACT:
A voltage regulator (400) having a charge pump includes a bias current circuit (402) which produces a bias current (I.sub.bias). The bias current (I.sub.bias) is mirrored by a first mirror circuit (404) and multiplied by gain stage Q4.sub.beta and mirrored again by a factor "c" on the output of DMOS2. The same I.sub.bias is mirrored by a ratio "b" and multiplied by the product of Q5.sub.beta and Q6.sub.beta. The push-pull current operation at the output terminal (416) is obtained by turning on and off switches SW1 (418) and SW2 (420) that are controlled by a clock signal. The voltage regulator (400) further includes an output voltage clamp (424) that keeps control of the V.sub.boost voltage by controlling the amount of bias current (I.sub.bias).

REFERENCES:
patent: 4166971 (1979-09-01), Schneider
patent: 4374357 (1983-02-01), Olesin et al.
patent: 5045773 (1991-09-01), Westwick et al.
patent: 5521544 (1996-05-01), Hatanaka
patent: 5585712 (1996-12-01), Isham
patent: 5818295 (1998-10-01), Chimura et al.
patent: 5850139 (1998-12-01), Edwards

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